// 分析服务
use std::sync::Arc;
use tokio::sync::RwLock;
use anyhow::Result;
use serde::{Deserialize, Serialize};

use codegraph_analytics::{
    ComplexityMetrics, QualityMetrics, HalsteadMetrics
};
use codegraph_core::GraphSystem;

use crate::error::AppError;

/// 分析请求
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AnalysisRequest {
    pub project_path: String,
    pub analysis_types: Vec<AnalysisType>,
    pub options: AnalysisOptions,
}

/// 分析类型
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum AnalysisType {
    Complexity,
    Quality,
    Trends,
    All,
}

/// 分析选项
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AnalysisOptions {
    pub include_tests: bool,
    pub include_dependencies: bool,
    pub max_depth: Option<u32>,
    pub file_patterns: Vec<String>,
}

impl Default for AnalysisOptions {
    fn default() -> Self {
        Self {
            include_tests: true,
            include_dependencies: false,
            max_depth: None,
            file_patterns: vec!["**/*.rs".to_string(), "**/*.ts".to_string(), "**/*.js".to_string()],
        }
    }
}

/// 分析结果
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AnalysisResult {
    pub project_path: String,
    pub timestamp: chrono::DateTime<chrono::Utc>,
    pub complexity: Option<ComplexityMetrics>,
    pub quality: Option<QualityMetrics>,
    pub trends: Option<TrendData>,
    pub summary: AnalysisSummary,
}

/// 趋势数据
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TrendData {
    pub complexity_trend: Vec<f64>,
    pub quality_trend: Vec<f64>,
    pub file_count_trend: Vec<u32>,
    pub period_days: u32,
}

/// 分析摘要
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AnalysisSummary {
    pub total_files: u32,
    pub analyzed_files: u32,
    pub issues_found: u32,
    pub overall_score: f64,
    pub recommendations: Vec<String>,
}

/// 分析服务
pub struct AnalyticsService {
    // 简化版本，暂时不使用具体的分析器
}

impl AnalyticsService {
    /// 创建新的分析服务
    pub fn new() -> Self {
        Self {}
    }

    /// 初始化分析服务
    pub async fn initialize(&self) -> Result<(), AppError> {
        // 简化版本，暂时不需要初始化
        Ok(())
    }

    /// 执行项目分析
    pub async fn analyze_project(
        &self,
        request: AnalysisRequest,
        _graph_system: Arc<RwLock<Option<GraphSystem>>>,
    ) -> Result<AnalysisResult, AppError> {
        let start_time = std::time::Instant::now();

        let mut result = AnalysisResult {
            project_path: request.project_path.clone(),
            timestamp: chrono::Utc::now(),
            complexity: None,
            quality: None,
            trends: None,
            summary: AnalysisSummary {
                total_files: 0,
                analyzed_files: 0,
                issues_found: 0,
                overall_score: 0.0,
                recommendations: Vec::new(),
            },
        };

        // 执行不同类型的分析
        for analysis_type in &request.analysis_types {
            match analysis_type {
                AnalysisType::Complexity => {
                    if let Ok(complexity) = self.analyze_complexity(&request).await {
                        result.complexity = Some(complexity);
                    }
                }
                AnalysisType::Quality => {
                    if let Ok(quality) = self.analyze_quality(&request).await {
                        result.quality = Some(quality);
                    }
                }
                AnalysisType::Trends => {
                    if let Ok(trends) = self.analyze_trends(&request).await {
                        result.trends = Some(trends);
                    }
                }
                AnalysisType::All => {
                    // 执行所有分析
                    if let Ok(complexity) = self.analyze_complexity(&request).await {
                        result.complexity = Some(complexity);
                    }
                    if let Ok(quality) = self.analyze_quality(&request).await {
                        result.quality = Some(quality);
                    }
                    if let Ok(trends) = self.analyze_trends(&request).await {
                        result.trends = Some(trends);
                    }
                }
            }
        }

        // 生成分析摘要
        result.summary = self.generate_summary(&result).await;

        let duration = start_time.elapsed();
        tracing::info!("Project analysis completed in {:?}", duration);

        Ok(result)
    }

    /// 分析复杂度
    async fn analyze_complexity(&self, _request: &AnalysisRequest) -> Result<ComplexityMetrics> {
        // 返回模拟数据
        Ok(ComplexityMetrics {
            cyclomatic_complexity: 15.5,
            cognitive_complexity: 12.3,
            halstead_complexity: HalsteadMetrics {
                distinct_operators: 10,
                distinct_operands: 15,
                total_operators: 25,
                total_operands: 40,
                vocabulary: 25,
                length: 65,
                calculated_length: 62.5,
                volume: 325.2,
                difficulty: 13.3,
                effort: 4325.16,
                time: 240.3,
                bugs: 0.108,
            },
            max_nesting_depth: 4,
            avg_nesting_depth: 2.5,
            function_complexity: {
                let mut map = std::collections::HashMap::new();
                map.insert("main".to_string(), 8.0);
                map.insert("process_data".to_string(), 12.5);
                map
            },
        })
    }

    /// 分析质量
    async fn analyze_quality(&self, _request: &AnalysisRequest) -> Result<QualityMetrics> {
        // 返回模拟数据
        Ok(QualityMetrics {
            duplication_percentage: 5.3,
            test_coverage: 85.5,
            technical_debt_ratio: 12.1,
            code_smells: 15,
            security_issues: 3,
            performance_issues: 2,
            documentation_coverage: 68.2,
        })
    }

    /// 分析趋势
    async fn analyze_trends(&self, _request: &AnalysisRequest) -> Result<TrendData> {
        // 返回模拟数据
        Ok(TrendData {
            complexity_trend: vec![12.5, 13.2, 14.1, 15.5],
            quality_trend: vec![82.1, 83.5, 84.2, 85.5],
            file_count_trend: vec![45, 48, 52, 56],
            period_days: 30,
        })
    }

    /// 生成分析摘要
    async fn generate_summary(&self, result: &AnalysisResult) -> AnalysisSummary {
        let mut summary = AnalysisSummary {
            total_files: 56, // 模拟数据
            analyzed_files: 52, // 模拟数据
            issues_found: 0,
            overall_score: 0.0,
            recommendations: Vec::new(),
        };

        // 基于分析结果计算总分和建议
        let mut scores = Vec::new();

        if let Some(complexity) = &result.complexity {
            scores.push(100.0 - complexity.cyclomatic_complexity * 2.0);
            if complexity.cyclomatic_complexity > 10.0 {
                summary.issues_found += 1;
                summary.recommendations.push("Consider reducing cyclomatic complexity".to_string());
            }
        }

        if let Some(quality) = &result.quality {
            scores.push(quality.test_coverage);
            if quality.test_coverage < 80.0 {
                summary.issues_found += 1;
                summary.recommendations.push("Increase test coverage".to_string());
            }
        }

        // 计算总分
        if !scores.is_empty() {
            summary.overall_score = scores.iter().sum::<f64>() / scores.len() as f64;
        }

        summary
    }
}

impl Default for AnalyticsService {
    fn default() -> Self {
        Self::new()
    }
}
